7,200 - 7,400.Anythiing above 7,800 and it would start to float the valves
lol u havent heard a v6 scream till uve heard one above 6,000 rpms,
heres 2 sould clips
they sound ****ed up caus ei took them with my cell phone
idling
http://2wai.ics-il.com/2.8.flowmaster.idle.wav
and a real light launch
http://2wai.ics-il.com/takeoff.wav